Muffler.



t. P. GHAI.

MUFFLER.

APPLICATION FILED HAIL-30. 19m.

Patented Aug. 20, 1918.

INVENTOR {Rim BY A QRNEYS.

ill'il'lll a i the ma PATENT OFFICE.

.mmzr 2. only, or DETROIT, mrcmoan.

IUFFLEB.

p iliatiou lk Patented AugnZU, 1918.

Application filed inch 30, um. 7 Serial No. 225,035.

To all when it may concern Be it known that LEMmrr P. Gear, a citizen of the United States, and residing at- Detroit, inthe county of \Vayne and State bf Michigan, have invented a new and Improved Mother, of which the following is a specification.

This invention relates to means for reducing the sound of the exhaust of internal combustion engines and its object is to provide a device of this character which shall produce a minimum-amount of back pressure while at the same time ha e maximum efiiciency as a muffler. a

This improved muffler for internal combustion engines consists in a series of cylin ders, one within the other connecting by means of-'a number of holes through their walls, of heads closin the ends of the ders, the inlet head eing provided with a passage to conduct the exhaust of the engine to the interior of the inner cylinder and the otherhead ha ring a series of passe es connccting a conduit with the spaces etween the cylinders and within the inner cylinder. It. also consists in forming the discharge passages in .the outlet head of increasin areas from the central cylinder outwardly and with their total areas less than the area of the intake opening of the mufller. It also consists in. roviding'a safety valve in the intake hea to relie've'the mufller'of excessive pressures. i f

In the accompanving drawing-Figure '1 is a central longitudinal section of this improved niufiier. Fig. 2'is a artial elevation o f'the inlet end thereof. 1g. 3 is Sit-(filter elevation and Fig.4 an inner elevation o a modified form of outlet head for this mufile'r.

Fig.' 5 is a section on the line 5-5 of Fig. 3. Fig. 6 isa view of the outlet head shown in Fig. 1, one half being in elevationand one halfin section on the line 6-6 of Fig. 1.

Similar reference characters refer to like parts throughout the several views.

- The pipe 1 connects this mother to the engine and through this ipe the exhaust gases of the engine is con uc ted into the. inlet head 2. A deflecting plate 3 guides the gases toward the opening =1 which is surrounded. gas

does not become empty after one e 1081011 by the gmular ribs 5, 6 and 7'that position ing cylinders 8, 9 and 10. cross bar 12 supports a bolt 13 which guides a safety valve 14, normally held down on its seat 15 by the spring 16. Should excessive linpressures occur within the head 2, this valve gill rise and permit the ases to escape.

' At the opposite endo the mulller is an outlet head 17 having ribs 18, 19 and 20 to 3 position the cylinders 8, 9 and. 10. Bolts 22 may screw into proper holesin, the head 2 and receive nuts 23 and thus hold the parts in position. The cylinder 8 is provided with a' series of holes 24 to permit the exhaust gases to pass to the space between it and the cylinder 9. The exhaust then passes around th s cylinder 9' to the holes 25 and to the s ace ibetween it'and the outer c linder 10.

he number and size of these ho es will'de' i pend upon the engine, but the combined area "of the holes in either cylinde-r"5 or-fi is preferably slightly less than the area of the pipe 1. v The head 17 is formed with a chamber 30 and with passa cs 27, 28 and 29 .-for the exhaust he wall of this chamber 30 1 bent'imvard at 32 around thebolts 22 to permit the nuts 23 tobe turned. A stud-bolt 34 extends in alinement with the discharge openin 33 in the head 17. and carries the rotatab e'second chamber. 35,-lugs 36 on the latter centeringit onthe head 17; A discharge pipe 37 18 mounted toconnect to this chamber, which may be locked-in any de-j sired positlon by the nut 38. The two heads;

ma have feet 39and' 4 0, if desired. he exhaust gases rush' into'the inner c l mder 8 and the major ortion passes iout t rough the'holes 24 intot e cylinder 9,;and-

fills t at cylinder,

\ passing then through the holes 25 into the cy 'i rder wandouethrough the passages 29. I-have ,found that the. pressure within the cyIinderS and therefore the back pressure'intheexliaust pipe 1 is greatly reduced byforming 'thepassage Win the head-17." The action seems to .be. in the nature'of an ejector, the jet of gas from this passage 27 driving the gases in the chamber 30 out before-it and serving-by itsfriction with the gases coming from the passages 28 and 29 to draw these gases from ,thecyli'm ders 9 and 10, these in turn serving to reduce thenspeed of t fpassage 27. This so reduces the speed of the from the passage 27 that the cylinder 8 direct flow of the gases from these pasagea 11o 0- gas coming from the serves to blow out. froin the 'cylinders all carbon, grease and other matter that may collect therein. This action is intensified by the action of the jet from the passage 28,

butthe individual result obtained is not as great as that from the passage 27. The flow of exhaust gases through these passa es 27 and 28 is almost noiseless and cannot e detected a few feet away. .Theouter chamber 35 may be turned to cause the pipe 37 to;

extend at any desired angle.

In Figs. 3 to 5 inclusive, an outlet head 44.

-- is shown provided with annular ribs 45, 46

and 47 to receive the ends of the cylinders.8,

9 and 10 and with holes48 to receive 'the ends of the bolts 22. 'The head has assages of concentric cylinders, the interior cylinder haying passages to permit the outward fiow .of exhaust gases, an mle'thead at one endof :lylindersand a chamber .on' the outer side,

ereof', said outlet'head being formed with: a series .of passages connecting said chamber said inner-cylinder, an outlet head closing the opposite ends-of said to the chambers formed between the walls of the c linders' l 4. n a muffler, the corhbinatiom'of a "I of concentric cyhnders, the interior cylinder havm passages to permit the-outward flow 49, 50 and 51 that connect into the interiors of the cylinders 8, 9 and 10 respectively, and into the interior of the spout 53, as sho'wn in Fig. 5. It will be noticed that the passage 51 is very much larger than 'theother two combined.

. The dimensions and proportions of the various details may all be varied without departing from the spirit of this invention set forth in the following claims. I claim r- 1. In a mufller the combination of a'series of concentric cylinders, the interior-cylinder i of the-cylin ers having a passage to conduct- 'having passages to permit the outward flow of exhaust ases, an inlet head at one end gasesto the interior of the inner cylinder, an

' outlet head and a chamber on the'outer side v the cylinders having; an inletpassage thereof, said outlet head being formed with a series of passages connectingsaid chamber to the chambers formed between the walls I ries of ohcentrimcylinders,the-interior'cyk of the cylinders 2. Ina m'ufiler, the combination of a series of concentric cylinders, the interior cylinder having passages to permit the outward flow of exhaust gases, an inlet headstone end of at right an les to the line of said cylinders to a mit ex :aust gases and an interior passage in alinemen't with the interior-cylinder to' conduct the. gases thereto, an outlet head and a chamberon'the outer-side thereof, said outlet 'head being formed with a series of passages connecting said chamber to the chambers formed between the walls of the cylinders.

3. In a mufller, the combination of a series .of the cylinder having an" inlet passage gasesto flow freely and with an opemng of the others.

of ex' a'ust. gases, an inlet headat one; end at ri ht an les to the line of said cylinders to a Init e aust ases and an interior passage an alinementiwith the inner cylinder to conduct the formed with a curved deflector to cause the int'osaid inner cylinder,

inlet passage; a. safet mg said-opening an aspring to hold the va yerionto lts seat, an. outlet. head and a chamber on the outer side thereof, said -out.-' 'let head bein formed with aseriesof'pas sages connecting said chambertothe chamhers formed between the' walls of the 'cyl- -inders.'

5. In. amufiler, the combination 'a se cilia er,- an outlet head-and 'a" rotatable v c 'ambe r ot i the-outerside thereof, said out Ses thereto, said-.head being at," inalinement with the" val-ve'normally' .clos-- asl let head being formed with a series of passages connecting said chamber to the chamhers formed-between the walls ofsaidcyl mders, and means to hold said chamber in any desiredposition, the innermost passage in the outlet P? sitar.

ead being of less area than any 4 

